1 Preheat the oven to 350 degrees. 2 Mash the bananas using the back of a fork. Add the egg, almond milk, and vanilla extract. Stir until combined. 3 Add the remaining ingredients and stir together. 4 Pour into prepared muffin tins and bake for 25-30 minutes until firm and cooked through. If you want a banana slice on each muffin, just save 6 slices before mashing the bananas and place on top of the muffins before baking.